Paste any text and instantly rewrite it into a polished formal register or a relaxed, conversational one. Everything runs in your browser.
Tone is mostly a matter of word choice, contractions, and a handful of opening phrases. This tool models that with three rule layers that run in order. First, a contraction layer: when you convert to a formal register it expands forms like can't → cannot, I'm → I am and won't → will not; when you convert to informal it contracts them back. Second, a lexical layer maps roughly 120 slang and casual items to their counterparts in a paired dictionary — wanna ↔ want to, kids ↔ children, a lot ↔ considerably, thanks ↔ thank you. Each pair is bidirectional, so the same data drives both directions. Third, a cleanup layer re-capitalizes the first letter of every sentence and trims stray spacing.
The matching is whole-word and case-insensitive, using word-boundary checks so that can inside candle is never touched, while the original capitalization of a replaced word is preserved. Because all of this is deterministic dictionary substitution rather than a neural model, the output is instant, fully private, and identical every time you run it — nothing is uploaded or stored. Treat the result as a strong first draft: read it through, because register also depends on sentence length and context that a rule engine cannot judge. The substitution counter tells you how many changes were made so you can gauge how far the tone shifted. Toggle any of the three layers off if you only want, say, contraction handling without slang swaps.